Visual Encoding

Circle Size = Magnitude
● M3–4 (Minor)
● M4–5 (Light)
● M5–6 (Moderate)
● M6–7 (Strong)
● M7+ (Major)

Circle Color = Depth
● Very Shallow (0–10 km)
● Shallow (10–20 km)
● Deeper (>20 km)

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